28X™ is a free-to-use period tracker, privacy safe, designed to create a beautiful space to understand your cycle, from first periods to perimenopause and menopause.

Your data stays yours. Always. No selling data. A Women's health app built entirely around privacy. Free for everyone, everywhere.

Discreet, clinically informed and very private. The first period tracker to achieve a 93% ORCHA rating.

Periods are better on 28X.

WHY WE’RE DIFFERENT
Most period trackers rely on subscriptions, ads, or sharing user data to make money.

28X is the new way to track periods.
- No subscriptions. Free for everyone, everywhere.
- You have the power over your own data. It stays with you on your device.
- No data selling, no data sharing. No cloud servers.
- No ads. No subscriptions. No tracking. No paywalls. No locked features.
- Calm, simple period tracking designed around privacy. Understand your body without giving up your data.
- We build 28X alongside our users, listening to real feedback to shape what people actually want and need from the app.

To help keep 28X free for everyone, you can contribute to an optional pay-it-forward feature that supports development and women and girls in vulnerable communities worldwide. No obligation.

WHAT’S INSIDE THE APP
Simple period tracking tools to help you understand your body.
- Track Your Cycle
- Period and cycle tracking
- Clear menstrual phase predictions
- Mood, energy, PMS and symptom logging
- Patterns you can actually understand

LEARN WOMEN'S HEALTH
Supportive, clinically informed content designed to be clear, accessible, and empowering.

Learn about:
- Hormones and cycle phases
- PMS and monthly changes
- Endometriosis and PCOS
- Perimenopause and menopause
- Skin, mood, and energy shifts
- Nutrition, lifestyle, contraception, and fertility

PRIVACY FIRST
- Your data stays with you.
- All data is stored on your device
- No cloud storage
- No tracking or profiling
- No ads
- No selling your data

Health tracking built around you, not your data.

FOR EVERYONE, EVERYWHERE
28X is free, global, and inclusive, designed for all backgrounds and life stages.

Whether you are tracking your first period or navigating menopause, 28X helps you understand your body without giving up your privacy.

28X Private Period™ is not a medical device and doesn’t diagnose, monitor, prevent, treat or predict any health condition. It’s also not designed to help you get pregnant or avoid pregnancy. Always speak to a healthcare professional for personal medical advice.